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| 1 | +--- |
| 2 | +Title: '.pop()' |
| 3 | +Description: 'Removes and returns element from the right end of the deque.' |
| 4 | +Subjects: |
| 5 | + - 'Computer Science' |
| 6 | + - 'Data Science' |
| 7 | +Tags: |
| 8 | + - 'Algorithms' |
| 9 | + - 'Collections' |
| 10 | + - 'Data Structures' |
| 11 | + - 'Deques' |
| 12 | +CatalogContent: |
| 13 | + - 'learn-python-3' |
| 14 | + - 'paths/computer-science' |
| 15 | +--- |
| 16 | + |
| 17 | +The **`deque.pop()`** method removes and returns an element from the right end of a deque. Removing an element from either end of a deque occurs in O(1) time. |
| 18 | + |
| 19 | +## Syntax |
| 20 | + |
| 21 | +```pseudo |
| 22 | +deque.pop() |
| 23 | +``` |
| 24 | + |
| 25 | +**Parameters:** |
| 26 | + |
| 27 | +This method does not take any parameters. |
| 28 | + |
| 29 | +**Return value:** |
| 30 | + |
| 31 | +Returns the element that was removed from the right end of the deque. |
| 32 | + |
| 33 | +**Exceptions:** |
| 34 | + |
| 35 | +- `IndexError`: Raised if the deque is empty when `.pop()` is called. |
| 36 | + |
| 37 | +## Example |
| 38 | + |
| 39 | +In this example, a single element is removed from the right end of the deque using `.pop()`: |
| 40 | + |
| 41 | +```py |
| 42 | +from collections import deque |
| 43 | + |
| 44 | +# Create a deque |
| 45 | +dq = deque([10, 20, 30, 40]) |
| 46 | + |
| 47 | +# Remove and return the rightmost element |
| 48 | +item = dq.pop() |
| 49 | +print("Removed element:", item) |
| 50 | +print("Deque after pop:", dq) |
| 51 | +``` |
| 52 | + |
| 53 | +This example results in the following output |
| 54 | + |
| 55 | +```shell |
| 56 | +Removed element: 40 |
| 57 | +Deque after pop: deque([10, 20, 30]) |
| 58 | +``` |
| 59 | + |
| 60 | +## Codebyte Example: Popping the two rightmost elements |
| 61 | + |
| 62 | +In this example, elements are removed from the right end of a deque one by one using `.pop()`: |
| 63 | + |
| 64 | +```codebyte/python |
| 65 | +from collections import deque |
| 66 | +
|
| 67 | +# Create a deque with some numbers |
| 68 | +numbers = deque([1, 2, 3, 4, 5]) |
| 69 | +
|
| 70 | +print("Initial deque:", numbers) |
| 71 | +
|
| 72 | +# Remove elements one by one from the right |
| 73 | +last_item = numbers.pop() |
| 74 | +print("Popped element:", last_item) |
| 75 | +print("Deque after first pop:", numbers) |
| 76 | +
|
| 77 | +# Pop again |
| 78 | +another_item = numbers.pop() |
| 79 | +print("Popped another element:", another_item) |
| 80 | +print("Final deque:", numbers) |
| 81 | +``` |
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